Battery device



FIG. 1 is a front perspective view of the battery device;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a left elevation view thereof;

FIG. 4 is a right elevation view thereof;

FIG. 5 is a front elevation view thereof;

FIG. 6 is a rear elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines showing the battery device are included for the purpose of illustrating environment and form no part of the claimed design. 

CLAIM The ornamental design for battery device, as shown and described. 